We introduce concepts of diagonal quasi-convexity and quasi-concavity in hyperconvex metric spaces.

我们介绍了超凸度量空间中对角拟凸和拟凹的概念。

Experimental investigations show that the semiempirical concavity calculation formulation given here are practical.

提出的计算凹度的半经验公式，经过实践考验证明具有一定的实用价值。

Objective: To investigate the effects of variations in vertebral endplate concavity on the mechanical behaviors of the lumbar motion segment.

目的：研究终板凹陷程度变化对腰椎运动节段生物力学影响。

It is evident that curvature of doming whether on the crest (convexity) or on the flanks (concavity) have no major effect on fracture densities.

很明显，穹窿的曲率在波峰(突起)或两翼(凹陷)对断裂密度都没有很大影响。

Results Paranasal concavity deformities of 17 patients were corrected. The results were satisfactory and no complication such as infection or implant being extruded occurred.

结果：17例患者鼻旁区凹陷得以矫正，外形效果满意，无感染、假体外露等并发症。